GB1319684A - Hoists - Google Patents

Hoists

Info

Publication number
GB1319684A
GB1319684A GB3028270A GB3028270A GB1319684A GB 1319684 A GB1319684 A GB 1319684A GB 3028270 A GB3028270 A GB 3028270A GB 3028270 A GB3028270 A GB 3028270A GB 1319684 A GB1319684 A GB 1319684A
Authority
GB
United Kingdom
Prior art keywords
motor
brake
voltage
potentiometer
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3028270A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Richier SA
Original Assignee
Richier SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Richier SA filed Critical Richier SA
Publication of GB1319684A publication Critical patent/GB1319684A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/23—Circuits for controlling the lowering of the load
    • B66C13/26—Circuits for controlling the lowering of the load by ac motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

1319684 Automatic speed control RICHIER 22 June 1970 [ 20 June 1969] 30282/70 Heading G3R A hoist is driven by an asynchronous motor 2 which is coupled to an eddy-current brake 3. A tachometer 6 responds to the speed of the motor and sends a signal to comparator 7 which also receives a reference signal from potentiometer 8. The error signal from the comparator is applied to a thyristor circuit 9 for controlling the motor voltage and to a rectifier circuit 10 which determines the voltage applied to the brake, and thus the braking torque. The torque changes rapidly with speed at low speeds to ensure stable operation, particularly with small loads. In this manner, the load is raised and lowered at set speeds. A current detector 15 is connected to a voltage regulator 16 which prevents sudden changes in the motor voltage when the potentiometer 8 is adjusted abruptly. In a modification, the brake is formed by an auxiliary stator winding arranged concentrically with the main stator winding of the motor. For lowering light loads, the auxiliary winding may have a smaller number of poles than the main winding, which provides the braking component.
GB3028270A 1969-06-20 1970-06-22 Hoists Expired GB1319684A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6919877A FR2045183A5 (en) 1969-06-20 1969-06-20

Publications (1)

Publication Number Publication Date
GB1319684A true GB1319684A (en) 1973-06-06

Family

ID=9035762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3028270A Expired GB1319684A (en) 1969-06-20 1970-06-22 Hoists

Country Status (2)

Country Link
FR (1) FR2045183A5 (en)
GB (1) GB1319684A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876918A (en) * 1972-08-14 1975-04-08 Hitachi Ltd Electric motor controlling system

Also Published As

Publication number Publication date
FR2045183A5 (en) 1971-02-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee